• Email: armechalloys@gmail.com
  • Landline: +91 - 022-6659 1540

Exporter & supplier of ASME B16.5 forged flanges in Mumbai


flanges manufacturer in india



Flanges specification

Manufacturing Size Faces Types ASME standards
  • 1/2" to 48"
  • 15NB - 1200NB
  • PN 2.5 - PN 400
  • FF (Flat Face)
  • RF (Raised Face)
  • RTJ (Ring Type Joint)
  • T&G (Tongue and Groove)
  • M&F (Male Female face)
  • LJ (Lap Joint)
  • ASME B16.5
  • ASME B16.47
  • ASME B16.36
  • ASME B16.48
Pressure Class Types Of Flanges Used In Oil and Gas Industry Manufacturing Process
  • 150 LBS
  • 300 LBS
  • 600 LBS
  • 900 LBS
  • 1500 LBS
  • 2500 LBS
  • Forged
  • Plate
  • Cast
Surface Finish Applications DIN & EN standards
  • Stock finish
  • Serrated finish
  • Spiral serrated
  • Concentric serrated
  • Smooth finish
  • Cold water finish
  • Mirror finish
  • Gas & Oil applications
  • Nuclear power
  • Petrochemical plants
  • Industrial piping connection
  • Aerospace constructions
  • Refinery industry
  • DIN 2578 Type 1 for flat flange
  • DIN 2527 Type 5 for blind flange
  • DIN 2627 Type 11 for weld neck flange
  • DIN 2558 Type 12 Threaded flange
Thread Types Value Added Services Testing Requirements
  • NPT
  • MPT
  • FPT
  • BSP
  • BSPT
  • Cutting
  • Coating
  • polishing
  • Beveling end
  • Marking tagging
  • MTR certification
  • Hardness test
  • Tensile test
  • Impact test
  • Visual inspection
  • Material inspection
  • PMI test
Origin Country and Manufacturing Standards Purpose of Forged Flange Common Considerations For Buying ASME B16.5 Flange
  • ANSI B16.5 - USA
  • PN 10 to PN400- Europe
  • DIN- Germany
  • ASME B16.5- USA
  • BS 10- Australia and UK
  • BS EN 1092-1 - Europe
  • Ghost - Russia
  • MSS SP44 - USA
  • AWWA - USA
  • JIS - Japan
  • API-605 - USA
  • UNI 2276/ 6091 - Italy
Connect pipes and valves together
  • Outside diameter
  • Nominal bore size
  • Pipe size
  • Bolt circle diameter
  • Thickness
Markings Special Flange Types Machining Process
  • Manufacturer logo
  • ASTM material
  • Grade
  • Pressure rating
  • Size
  • Face type
  • Country origin
  • Schedule
  • Heat Number
  • Expanding flanges
  • High hub flanges
  • Nipo Flanges
  • Groove and tongue flanges
  • Male and female flanges
  • Material selection
  • Material cutting
  • Shaping
  • Heat treatment
  • Forming
  • Forging
  • Machining
  • Surface finish
  • Inspection
  • Quality control
Common Types Of Joint Flange Connection Defining Factors of Forged Steel Flange
  • Bolted joint
  • Threaded joint
  • Welded joint
  • Threaded
  • Welded
  • Type
  • Face
  • Standards
  • Dimensions
  • NPS
  • Pressure class
  • Material
  • Schedule

IBR/ EIL approved steel flanges supplier in India


Forged steel flanges pressure capacity

Type Of Flange Pressure Capacity NPS Uses
Threaded Flanges Low pressure 1/2" To 12" Without Welding attaching
Lap joint Flanges Low pressure 1/2" To 48" Low installation cost
Slip on Flanges Low pressure 1/2" To 48" Easy assembly
Blind Flanges Very high pressure 1/2" To 48" Flow pressure testing
Weld Neck Flanges High pressure 1/2" To 48" High-pressure systems

1st forged steel flanges manufacturer in Mumbai who offer CNC machining and forging services


Machining process of B16 flange

Machining process of B16 flange


Find all types of flanges in our stock, we offer in house manufacturing facilities to produce large diameter pipe flanges in our Mumbai factory


Types of pipe flanges

Ring Type Joint Flange

Ring Type Joint Flange

Raised Face Flange

Raised Face Flange

Tongue and Groove Flange

Tongue and Groove Flange

Male and Female Flange

Male and Female Flange

Flat Face Flange

Flat Face Flange

Reducing Flange

Reducing Flange

Square Flange

Square Flange

Orifice Flange

Orifice Flange

Puddle Flange

Puddle Flange

Anchor Flange

Anchor Flange

Bleed Ring

Bleed Ring

Nipo Flange

Nipo Flange



Comparison of flanges manufacturing methods

Three main manufacturing technique of forged steel flange

  • Casting
  • Cutting from plate material
  • Forging

Casting Forged Cutting/Plate
Cost/ Price Better Good Best
Strength & Capacity Better Best Good
Tolerances Best Good Better
Limiting Material Waste Better Best Good
Material and Sizes Best Better Good

Raw materials for pipe weld flanges manufacturing

Raw materials for pipe weld flanges manufacturing

Stainless Steel Flanges Carbon Steel Flange Alloy Steel Flange
  • ASTM A105 Flange
  • ASTM A350 LF2 Flange
  • Low Temp Carbon Steel
  • A694 Grade F42
  • ASTM A694 F46
  • SA 694 F52
  • Carbon Steel F56
  • High Yield F60
  • A694 Gr F65
  • ASTM A694 F70
  • Alloy Steel F1
  • ASTM A182 F5
  • SA182 F9
  • A182 Grade F11
  • F22 Alloy Steel
  • ASME A182 Grade F91
Super Duplex Flange Duplex Flange Titanium Flange
  • ASTM A182 F53
  • ASTM A182 F55
  • ASTM A182 F60
  • ATM A182 F61
  • ASTM A182 F51
  • ASTM A182 F44
  • Titanium Grade 2 : ASTM B381 UNS R50400
  • Titanium Grade 5 : ASTM B381 USN R56400
Inconel Flange Incoloy Flange Hastelloy Flange
  • Inconel 600 : ASTM B564 UNS N06600
  • Inconel 625 : ASTM B564 UNS N06625
  • Inconel 601 : ASTM B564 UNS N06601
  • Inconel 617 : ASTM B564 UNS N06617
  • Inconel 686 : ASTM B564 UNS N06686
  • Inconel 690 : ASTM B564 UNS N06690
  • Inconel 725 : ASTM B564 UNS N07725
  • 693, MA754, 751, 706, 718, 601GC, MA758, 783, X-750, 602CA, 603XL, 718SPF
  • Incoloy 800 : ASTM B407 UNS N08800
  • Incoloy 800H : ASTM B407 UNS N08810
  • Incoloy 800HT : ASTM B407 UNS N08811
  • Incoloy 825 : ASTM B407 UNS N08825
  • 903, 907, 945, 925, 926, 832, 330, 25-6HN, DS, 028, 020,909, 945X, MA956, 908, A-286, 27-7MO, 864, 890
  • Hastelloy C22 : ASTM B366 UNS N06022
  • Hastelloy C276 : ASTM B366 UNS N10276
  • Hastelloy C2000 : ASTM B366 UNS N06200
  • B-2, B, B-3, C, C-4, G-35, G-30, N, G-3, S, W, X
Monel Flange Nickel Alloy Flange Copper Nickel Flange
  • Monel 400 : ASTM B564 UNS N04400
  • Monel 401 : ASTM B564 UNS N04401
  • Monel K500 : ASTM B564 UNS N05500
  • Nickel Alloy 200 : ASTM B564 UNS N02200
  • Nickel Alloy 201 : ASTM B564 UNS N02201
  • Copper Nickel 90/10 : ASTM B151 UNS C70600
  • Copper Nickel 70/30 : ASTM B151 UNS C71500


Forged flanges price
Specialized in manufacturing all types plate & forged flanges in India, view dimensions and price list at Armech Alloys

Forged flanges price

SCH 40, Grade : SS 304, Face (RF) Price per piece in US Dollar

  • 3/4 inch, Class 150, SORF
  • 1 inch, 150#, SORF
  • 1-1/2 inch, 150 LBS, BLRF
  • 2 inch, CL 150, BLRF
  • 3 inch, Class 150, BLRF
  • 1 1/2 inch, CL 150, WNRF
  • 3 1/2 inch, CL 150, WNRF
  • 4 inch, 150#, WNRF
  • US $1.20
  • US $1.50
  • US $2.41
  • US $3.21
  • US $4.53
  • US $1.89
  • US $5.48
  • US $7.91

ASME B16.5 flange dimensions

Class 150

ASME B16.5 flange dimensions
NPS O.D. (Inch) SORF Bore Inner Diameter (MM)
WNRF Bore Inner Diameter (MM)
Diameter Hub Base (Inch)
Minimum Wall Thickness (MM)
RF Diameter (Inch)
Bolt Holes Number Holes Diameter (MM) Bolt Circle (Inch)
1/2 3.50 9.65 22.35 15.74 1.19 1.38 4 15.74 2.38
3/4 3.88 11.17 27.68 20.82 1.50 1.69 4 15.74 2.75
1 4.25 34.54 26.67 1.94 12.7 2.00 4 15.74 3.12
1 1/ 2 5.00 49.53 40.89 2.56 15.74 2.88 4 15.74 3.88
2 6.00 61.97 52.57 3.06 17.52 3.62 4 19.05 4.75
3 7.50 90.67 77.97 4.25 22.35 5.00 4 19.05 6.00
4 9.00 116.07 102.36 5.31 22.35 6.19 8 19.05 7.50
5 10.00 143.7 128.2 6.44 22.35 7.31 8 22.35 8.50
6 11.00 170.68 154.17 7.56 23.87 8.50 8 22.35 9.50
8 13.50 221.48 202.69 9.69 26.92 10.62 8 22.35 11.75
10 16.00 276.35 254.50 12.00 28.44 12.75 12 25.4 14.25
12 19.00 327.15 304.8 14.38 30.22 15.00 12 25.4 17.00
16 23.50 410.46 387.35 18.00 35.05 18.50 16 28.44 21.25
18 25.00 461.77 438.15 19.88 38.1 21.00 16 31.75 22.75
20 27.50 513.08 488.95 22.00 41.14 23.00 20 31.75 25.00
22 29.50 564.38 539.75 24.25 44.45 25.25 20 35.05 27.25
24 32.00 615.95 590.55 26.12 45.97 27.25 20 35.05 29.50


ASME B16.5 flanges weight

Class 150

Normal Pipe Size Slip
On (LBS)
Threaded (KG) Socket
Weld (LBS)
Lap
Joint (KG)
Blind (LBS) Weld
Neck (KG)
1/2 1.10 0.5 1.98 0.5 1.98 0.9
3/4 1.98 0.9 1.98 0.9 1.98 0.9
1 1.98 0.9 1.98 0.9 1.98 1.4
3.08 1.4 3.08 1.4 3.08 1.4
3.08 1.4 3.08 1.4 3.96 1.8
2 5.07 2.3 5.07 2.3 5.07 2.7
7.9 3.6 7.93 3.6 7.05 4.5
3 9.03 4.1 9.03 4.1 9.03 5.2
8.81 5.4 8.81 4 13.00 5.4
4 13.00 5.9 13.00 5.9 16.97 7.4
5 14.99 6.8 14.99 6.8 19.84 9.5
6 18.95 8.6 18.95 8.6 26.89 11.7
8 29.76 13.5 29.76 13.5 46.73 18.9
10 42.76 19.4 42.76 19.4 69.44 24.3
12 63.49 28.8 63.49 28.8 122.13 39.6
14 89.28 40.5 89.28 47.3 138.8 51.3
16 105.16 44.1 97.22 63 178.57 63
18 128.97 58.5 128.97 72 218.25 74.3
20 163.80 74.3 163.80 87.8 282.85 88.7
22 183.64 83.3 183.64 110.3 352.29 101.3
24 218.25 99 218.25 123.8 426.59 120.6

ANSI B16.5 flange pressure ratings in PSI

Temperature in (°F) Fahrenheit 900 LBS 1500 LBS 2500 LBS 150 LBS 300 LBS 600 LBS
-20 to 100 2220 3705 6170 285 740 1480
200 2035 3395 5655 260 680 1360
300 1965 3270 5450 230 655 1310
500 1810 3015 5025 170 605 1205
600 1705 2840 4730 140 570 1135
700 1590 2655 4425 110 530 1060
800 1235 2055 3430 80 410 825
900 690 1150 1915 50 230 460
1000 255 430 715 20 85 170


Working pressure of IBR approved flanges in Bar

Temperature in Celsius (°C)
Class Pressure
Class 900 Class 1500 Class 2500 Class 150 Class 300 Class 600
-29 - 38 155 259 431 19.8 51.7 103.4
50 155 259 431 19.5 51.7 103.4
100 155 258 429 17.7 51.5 103.0
200 146 243 405 13.8 48.6 97.2
300 129 214 357 10.2 42.9 85.7
400 104 174 290 6.5 34.7 69.4
500 34.7 57.9 96.5 2.8 11.6 23.2


Bolts for ASME B16.5 flanges

Class 150

NPS Flange Diameter (Inch) Bolt Holes Diameter(MM) Bolt Circle (Inch) Bolts Number
Bolts Diameter(MM)
1/4 3-3/8 15.74 2-1/4 4 12.7
1/2 3-1/2 15.74 2-3/8 4 12.7
3/4 3-7/8 15.74 2-3/4 4 12.7
1 4-1/4 15.74 3-1/8 4 12.7
1-1/4 4-5/8 15.74 3-1/2 4 12.7
1-1/2 5 15.74 3-7/8 4 12.7
2 6 19.05 4-3/4 4 15.87
2-1/2 7 19.05 5-1/2 4 15.87
3 7-1/2 19.05 6 4 15.87
3-1/2 8-1/2 19.05 7 8 15.87
4 9 19.05 7-1/2 8 15.87
5 10 22.35 8-1/2 8 19.05
6 11 22.35 9-1/2 8 19.05
8 13-1/2 22.35 11-3/4 8 19.05
10 16 25.4 14-1/4 12 22.22
12 19 25.4 17 12 22.22
14 21 28.44 18-3/4 12 25.4
16 23-1/2 28.44 21-1/4 16 25.4
18 25 31.75 22-3/4 16 25.4
20 27-1/2 25 20 25.4 31.75
24 32 35.05 29-1/2 20 25.4


Gasket for ASME B16.5 flanges

NPS O.D. I.D.
DN Class 150 Flanges Class 300 Flanges Inner Diameter
15 48 54 21
20 57 67 27
25 67 73 33
32 76 83 42
40 86 95 48
50 105 111 60
65 124 130 73
80 137 149 89
90 162 165 102
100 175 181 114
125 197 216 141
150 222 251 168
200 279 308 219
250 340 362 273
300 410 422 324
350 451 486 356
400 514 540 406
450 549 597 457
500 606 654 508
600 718 775 610


Pipe flange thickness chart

NPS Schedule 40 Schedule 80
½ 0.10 0.14
¾ 0.11 0.15
1 0.13 0.17
1 ¼ 0.14 0.19
1 ½ 0.14 0.20
2 0.15 0.21
2 ½ 0.20 0.27
3 0.21 0.30
3 ½ 0.22 0.31
4 0.23 0.33
5 0.25 0.37
6 0.28 0.43
8 0.32 0.50
10 0.36 0.59
12 0.40 0.68
14 0.43 0.75
16 0.50 0.84
18 0.56 0.93
20 0.59 1.03
22 - -
24 0.68 1.21


Characteristics Of ANSI B16.5 class 150 forged flanges

Characteristics Of ANSI B16.5 class 150 forged flanges

Uses of EIL approved steel flanges face types

Used Raised face (RF) flange Flat face (FF) flange Ring type joint (RTJ) flange
Low pressure water pipe systems No Yes No
Oil and gas Yes No Yes
Chemical Process & Chemical plants Yes No No
Valves No Yes No
Cast iron equipment No Yes No
high temperature and high pressure up to 1,382⁰F & 750⁰C No No Yes


Joint types of B16.5 flanges

  • Bolted joint requires a ASME B16.5 pipe flange
  • Threaded joint (male and female threads)
  • Welded joint (process of melting metal )


Design of industrial flanges

Design of industrial flanges